High performance hydrogen storage from Be-BTB metal-organic framework at room temperature

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Room temperature hydrogen storage is crucial for hydrogen-powered vehicles.
• Metal-organic frameworks (MOFs) are promising for hydrogen storage.
• Beryllium benzene tribenzoate (Be-BTB) exhibits high gravimetric hydrogen uptake.

Purpose of the Study:

• Investigate the high hydrogen uptake of Be-BTB at room temperature.
• Understand the interaction between hydrogen and the Be-BTB framework.
• Compare Be-BTB performance against compressed H2 tanks and other MOFs.

Main Methods:

• Atomistic simulation
• Continuum modeling
• Thermodynamic energy optimization (TEO) model

Main Results:

• Beryllium rings in Be-BTB significantly contribute to hydrogen interaction.
• Be-BTB demonstrates a 2.3 wt % hydrogen storage capacity at 298 K.
• Be-BTB offers superior energy per volume and mass compared to MOF-5 and MOF-177.

Conclusions:

• Pore size and framework mass are key factors for Be-BTB's superior hydrogen adsorption.
• While not meeting all DOE targets, Be-BTB shows potential for efficient hydrogen storage systems.